AutoCAD is my anchor program that I use to scale drawings such as PDFs, Illustrator, or other CAD programs. My experience with using AutoCAD is both extensive and intensive because I have done so many projects in AutoCAD. I do most of my preliminary work in AutoCAD and use it to produce many of my 2D drawings sets. The import and export functions in AutoCAD make working with other CAD programs possible. AutoCAD is the glue that ties together the SketchUp files, VectorWorks files, Rhino files, PDF files, and Illustrator files that I get from project managers.